The U.S. Steel Plant Duluth Works Site, a former steel mill and coking operation, is on both the federal National Priorities List (NPL) and the State of Minnesota Permanent List of Priorities (PLP). The site is approximately 600 acres (500 land and 100 river sediment). It is located 4 miles south-west of the Duluth central business district and adjacent to the neighborhood of Morgan Park.
This site has 18 Operable Units (OU) and two areas identified within the 1989 Record of Decision (ROD) for remedial action. Current work on this site is focused on the identification and cleanup of the sediments in the St. Louis River and follow up actions from the 2013 Five-year Review. Most land-based contamination has been addressed as specified in the ROD.